Our radar has picked up a single that an unidentified object is heading for our city .（)

A.impressive

B.aggressive

C.ref1ective

A.Yes, they have some bad habits.

B.Cheer up. I believe he will overcome it.

C.Well, he likes picking things up when he is out.

The closest point of approach (CPA ) of a contact on a relative motion radar may be determined ______.

A.immediately when the contact is noted on radar

B.only if the radar scope is watched constantly

C.after the contact has been marked at least twice

D.by an occasional glance at the radar

A.picked up

B.gave up

C.ended up

D.went up

A.at

B.out

C.on

D.up

The articulated light is superior to other types of buoys because ______．

A.The radar reflectors reflect better signals

B.Fog horn signals travel farther to sea

C.It is equipped with strobe lights

D.It has a reduced watch circle

A.The ARPA will generate data as if the target was still being tracked by radar

B.The ARPA will give an audible and/or visual lost target alarm

C.The ARPA will generate data based on sea return echoes from the vicinity where the target was lost

D.The ARPA has lost all memory of the target and must recompute the target data

His house is easily picked() from the rest for it has a large black door.

A over

B out

C on

D upon

Go Ahead—Cook with It

别怕—就用它来烹饪

It's grapefruit season. From now through March, the golden orbs are ripe for the picking. And they're not just for breakfast any more.

Hanging around on trees all about California: grapefruit—heavy with juice, tartly sweet, beguilingly perfumed．Round and yellow as happy faces or suns, they seem to ripe just as the general populace sinks into its annual round of post-holiday dietary self-chastisement.

Coincidence？ Perhaps. But we say run with it.

Look beyond the obvious salvo of half a grapefruit for breakfast attacked with a jagged spoon and you'll find a marvelous fruit for peeling and eating out of hanD．There's nothing like it for inducing simultaneous feelings of gastronomic piety and delight at recapturing a long-lost pleasure. It's sensual: the aroma of essential oils as they spurt daintily from the pores of the thick skin, the ripping sound of the tenacious segments being pulled apart, the juice dripping down. And it's delicious.

But don't stop there. Cook with grapefruit. Use its juice to flavor sauces. Section and scatter it. Bake with it. Candy its peel. Grapefruit is milder and sweeter than lemon, but it can be used in many of the same ways—squeezed on grilled fish, made into a brightly flavored curD．And if you're looking for gorgeous color, red grapefruit offers extra plate appeal.

The notion that red grapefruit is sweeter than white or yellow grapefruit is, however, a myth, according to citrus specialists. (The story grew out of a marketing campaign by Texas growers. ) Red grapefruits get their color from lycopene, which has health benefits (its an antioxidant)but does not affect flavor.

Sweetness is determined, rather, by the length of time the fruit has been hanging on a tree. A grapefruit picked in December isn't as sweet as one picked in February, so if you have a tree, just pick fruit as needed．

If not, ask at your farmers market about the different varieties available, all of which have their fans. California reds include the medium-pink Rio Reds from the Caochella Valley and the Star Ruby from Central Valley (and Texas). Yellow Marsh is a familiar yellow variety and the Duncan, while not usually labeled as such in supermarkets, is a reliable white.

For those who don't like the tartness of a true grapefruit, Oro Blanco—the half-grapefruit, half-acidless pummelo—is sweeter and can be used in salads.

Our salad of jicama strips, thinly sliced snow peas, fresh pea sprouts (available in Asian markets)and red grapefruit sections has an appealing crunch. Its delicately harmonious flavors are pulled together with a faintly sweet dressing of grapefruit juice, tarragon and mint.

The strikingly pink sauce of our baked halibut dish contrasts with the white flesh of the fish for an artful plate—and it's easy to make. Before baking, marinate the halibut in grapefruit juice with garlic and thyme. Sauce it with a reduction of grapefruit juice combined with blood orange juice, which deepens the color and softens the flavor. Then whisk in bits of cold butter for silkiness.

A rich crust is a perfect foil for the tangy grapefruit curd filling in our pretty tartlets. Both grapefruit juice and lemon juice are used in the curd to focus the flavor; grapefruits zest enlivens the crust. Garnish them with whipped cream and candied grapefruit peel.

For cooking, select heavy fruit, which indicates juiciness. (If you're making a batch of candied peel, however, lighter fruit will indicate more peel.) Before juicing, roll a grapefruit under your hand on the countertop to help extract the most juice. Avoid lumpy fruit, which may be over-ripe.

And finally, for those whose resolute January s

A．The grapefruit becomes ripe just after a holiday in a year so that people can consume more food．

B．The grapefruit matures in autumn to provide people with a kind of rich food．

C．The grapefruit can provide people with a kind of favorite fruit when they have been on diet for a few days after the Christmas holiday during which they ate too many rich foods.

D．The grapefruit matures as self-chastisement for people.

Passage Four

Most people do not think of fishes and other sea animals as having voices, and of those who are aware of the fact that many of them can "speak", few understand that these "conversations" have significance. Actually, their talk may be as meaningful as much of our own. For example, some sea animals use their "voices" to locate their food in the ocean expanses (广阔的区域); others use their "voices" to let their fellows know of their locations; and still others, as a means of obtaining mates. Sometimes, "speaking" may even mean the difference between life and death to a sea animal. It appears in some cases that when a predator (食肉动物) approaches, the prey (被捕的动物) depends on no more than the sounds it makes to escape.

Fish sounds are important to man, also. By listening to them, he can learn a great deal about he habits of creatures that make them, the size of the School they form, the patterns of their migrations, and the nature of the environments in which they live. He can also apply this nformation to the more effective utilization of the listening spots he has set up to detect enemy submarines (潜水艇). A knowledge of fish sounds can avoid confusion and unneeded effort when a "new" sound is picked up and the sound sentry (哨兵) must decide whether or not to call an alarm.

46. Among the people who know that many sea animals have voices, few ______.

A. know the meaning of their conversations

B. realize that they can communicate with each other

C. realize that they can make speeches

D. could understand their conversations