—Excuse me, are the glasses Mike’s?
—No, they __________be Mike’s. He doesn’t wear glasses.
句意：——打扰一下，这个眼镜是Mike的吗？——不，它们一定不是Mike的。他不戴眼镜。
考查情态动词辨析。needn't不必；can't不可能；shouldn't不应该；mustn't禁止。根据“No”及“He doesn’t wearglasses”，可知，Mike不戴眼镜，所以这个眼镜一定不是他的，表否定的推测，故选B。
—Excuse me, are the glasses Mike’s?
—No, they __________be Mike’s. He doesn’t wear glasses.
— Is that man your friend Tom?
—That man ________ be him,because he has gone to Canada.
—Sam, ________ I join you in the community service?
—Of course you can.
________you smell something burning? Go and see what's happening.
下面四个交通标志图是轴对称图形的是（ ）
—Could you hang out with me, Kate?
—Sorry, I ________. I have to do my homework.
“天问一号”在经历了7个月的“奔火”之旅和3个月的“环火”探测，完成了长达5亿千米的行程，登陆器“祝融”号火星车于2021年5月15日7时18分从火星发来“短信”，标志着我国首次火星登陆任务圆满成功，请将5亿这个数用科学记数法表示为（ ）
We ________ see which way to go if the stars do not twinkle（闪耀）so.
下列数轴表示正确的是（ ）
