________ too much exposure to wind may cause the
dryness of skin, so too much exposure t
o the sun may result in cancer.
a. Just as b. While c. If d. Now that
I didn’t see her in the meeting room this morning. She _____ at the meeting.
| A．mustn’t have spoken | B．shouldn’t have spoken |
| C．needn’t have spoken | D．couldn’t have spoken |
----Did you happen to see ____ black and ____ white cat?
----Is she missing? I told you to take care of her.
| A．the; the | B．the; / | C．a; / | D．a; the |
Apples are usually sold by ________ weight and eggs are sometimes sold by ________ dozen.
| A．the; the | B．/;a |
| C．/; the | D．the; a |
— Did you happen to see _______ black and _______ white cat?
— Are they missing? I told you to take care of them.
| A．a; 不填 | B．the; 不填 | C．the; the | D．a; the |
Many people agree that ______ knowledge of English is a must in _______ international trade today.
| A．the, an | B．a, 不填 | C．the, the | D．不填, the |