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13 —It's no easy task to catch a ticket on a website that receives 1 billion clicks daily.

―I can't agree with you more. There    be errors for every single step.

A. should    B. must

C.  will    D. can

13.   D考査情態動詞。句意:"在網上搶到、張票不是容易的任務,因為網上每天有十億的點擊率。""我非常贊同你的觀點,每一步都可能會出錯。"這里用can表示客觀的可能性。所以選D。

題目來源:2015全品語法快練高中英語新課標 > 訓練24 情態動詞和虛擬語氣

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A

If you travel to a new exhibit at the San Francisco Conservatory of Flowers* you will have chances to see some meat-eating plants. Take bladderworts (貍藻類植物),a kind of such plants, for exam?ple. They appear so small and grow in a quiet pond. But they are the fastest known killers of the plant kingdom, and able to capture a small insect in 1/50 of a second using a trap door !

Once the trap door closes on the victim,the enzymes(酉每)similar to those in the human stomach slowly digest the insect. When dinner is over,the plant opens the trap door and is ready to trap again.

Meat-eating plants grow mostly in wet areas with soil that doesn't offer much food value. In such conditions, these amazing plants have developed insect traps to get their nutritional needs over thousands of years. North America has more such plants than any other continents.

Generally speaking,the traps may have attractive appearance to fool the eye, like pitcher plants, which get their name because they look like beautiful pitchers (罐)full of nectar(花蜜).

The Asian pitcher plant, for example,has bright colours and an attractive half-closed lid. Curious insects are tempted to come close and take a sip, and then slide down the slippery(光滑的)slope to their deaths.

Hair-like growths along the pitcher walls ensure that nothing can escape, and the digestive enzymes can get to work. A tiny insect can be digested in a few hours, but a fly takes a couple of days.

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