The example of American Indian languages in the passage is to illustrate that ______. A: American Indian languages are not backward B: "Backward" languages are borrowing from other languages C: "backward" languages may possess quite complicated vocabularies D: Western languages may also borrow from "backward" languages

The meaning of "bend over backward" is ( ). A: trying one's best B: trying to bend backward C: trying to kneel down

forward(100)等价于backward(-100)。（）

‏When what is referred to occurs in a previous context and the definite article has to point backward for its meaning, this is known as _____ reference.‏ A: forward B: backward C: anaphoric D: cataphoric

When installing a handsaw blade, you should ( ) A: make sawtooth face forward B: make sawtooth face forward or backward C: make sawtooth face backward D: neglect sawtooth direction

Group 5 is ______group. A: Twist B: Armstand C: Forward D: Backward

Deductive reasoning is a __________ approach. A: bottom-up B: forward C: backward D: top-down

There are two approaches to searching for a plan, one is ________________ search, and the other is backward relevant-states search.

“backward mapping”，即回溯图式的政策，也被称为（）的政策。

18. Even though this area is known ___ backward in terms of civilization, it will become an example of rapid development.