Question

英语完形填空题 [各位帮帮忙，有一道题不明白啊。。。非常感谢]

Scientists have always wanted to know more about the universe.Years ago they knew many things about the moon. They knew how big it was and how far away from the earth. But they wanted to know more about it. They thought the best way was to send men to the moon.The moon is about 384, 000 kilometres away from the earth. A plane cannot fly to the moon because the air reaches only 240 kilometres away from the earth. But something can fly even when there is no air. That is a rocket（火箭）.

How does a rocket fly? There is gas（气体）in the rocket. When the gas is made very hot inside the rocket, it will rush out of the end of the rocket, so it can make the rocket fly up into the sky. Rockets can fly out into space. Rockets with men in them have been to the moon.Several rockets without men in them have flown to another planet（行星）much farther away than the moon. One day rockets may be able to go to any place in space.

!!!!!! 为什么是They thought the best way was to send men to the moon.
而不是They thought the best way was to send planes to the moon.

Answer 1

send1
及物动词 vt.

1.发送,寄[O1][O2][(+to)]
She sent me a Christmas card.
她给我寄来一张圣诞贺卡。
Please have this note sent to Mr. Harrison.
请派人把这张条子送给哈里森先生。
You'd better send the letter by air.
这封信你最好寄航空。
2.派遣,打发;使进(学校等)[O2][O]
He sent his son to return the books to the library.
他派他儿子把书还给图书馆。
3.使进入(特定状态);(迫)使[O][O8][O4]
A hail of fire from us sent the aggressors fleeing panic-stricken.
我们一阵炮火打得侵略者惊惶逃窜。
The news almost sent her mad.
这消息几乎使她发疯了。
4.发射;发出;长出[O][(+out/forth)]
The flowers send forth fragrance.
这些花散发出香味。
5.传递;转达[O1]

不及物动词 vi.

1.差使;派人;送信[+to-v]
Has she sent for a taxi?
她有没有请人去叫出租车?

send2
名词 n.

1.波浪的推进力
2.船受浪推动向上抬起

要加人，而不是物

Answer 2

下文有提示嘛：
No1. A plane cannot fly to the moon because the air reaches only 240 kilometres away from the earth.
No2. Rockets with men in them have been to the moon
整篇文章重点都在讲rocket,而不是plane.