A. pick out ripe fruits
B. spot the insects quickly
C. distinguish different damages to the leaves
D. recognize unhealthy tomato leaves
4. We can infer from the last paragraph that the e-nose .
A. is unable to tell the smell of flowers
B. is not yet used in greenhouses
C. is designed by scientists at Purdue
D. is helpful in killing harmful insects
【参考答案】1—4、CDCB
短文改错
Usually most divers don’t go very deep. Mainly they dive to 1.
a depth of about 20 meter. Then they swam around as they slowly .
return to the surface. Everyone wants to dive must first have diving
.
lessons. There are few dangers that you have to learn about. For one .
thing, you might have problems with its air bottle. A diver must .
know how the equipment works and is able to recognize possible .
problem. There are also dangerous types of fish that you must look 7.
out for. You must be familiar to the environment you’ll be diving .
in. Before you go on a dive, make sure you know that what you are
.
getting into. Diving may look easily, but if you don’t have the.
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