Jungle country is not friendly to man, but is possible to survive there. Yo

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问题    Jungle country is not friendly to man, but is possible to survive
there. You must have the right equipment and you must know a lot             【S1】______
important things about woodcraft. Then your chances of staying living       【S2】______
are very good.
No one should go into the jungle without the right equipment. You
need lightweight clothings, a good sheath knife or machete, and a          【S3】______
compass, fishhooks and a line, a rifle and ammunition, matches in a
waterproof container, and a poncho are necessary too. Such is a             【S4】______
mosquito net to protect the head.
In the jungle you can get hopeless lost within five minutes after       【S5】______
leaving a knowing landmark. That is why you should always carry a          【S6】______
compass. In open country, during the day, you can tell which way to go
by studying the sun. At night the stars are sure of guides to direction.    【S7】______
But in most places the jungle rooftop is so thick that this is impossible    【S8】______
to see sun or the stars. Again and again you must check your position by
the compass.
Keep alert. Watch the ground in front of you carefully. Stop and
listen now and again. Avoid haste, and rest often. In a place where is       【S9】______
hot and humid, the person who sets a fast pace will some become tired.
A steady, even pace is wisest on the long run.                               【S10】______ [br] 【S8】

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答案 this→it

解析 this→it语法错误。It is．．．to do sth．固定句型，it在这里作形式主语，to do sth．动词不定式是真正主语。

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Jungle country is not friendly to man, but is possible to survive there. Yo

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