语法与词汇Lichens grow extremely well in very cold parts of the world ____plants can survive.
语法与词汇The average (surface temperature) of the Earth (has been risen) by (approximately) one degree (over the last) century.
语法与词汇I will employ the man ______ they say is a fluent speaker of English.
语法与词汇Outbreaks of diseases in trees commonly occur _____ stressed because of drought or other environmental factors.
语法与词汇---- to learn about human origins and evolution, the physical anthropologist studies fossil remains and observes the behavior of other primates.
语法与词汇This is ___________ such a thing.
语法与词汇The province of Alberta lies along three of the major North American flyways Used by birds _______between their winter and summer homes.
语法与词汇___ places on the Earth where plant and animal life has not been affected by the activities ofhumans.
语法与词汇In the early 1900's, Albert Einstein showed---, under special circumstances, matter and energy can be converted into one another.
语法与词汇Geometrically, the hyperbolic functions are related to the hyperbola, ____ the trigonometric functions are related to the circle.
语法与词汇In 1974, US president R.M. was charged with obstructing justice, (abusing) his constitutional (authoritative), and failing (to obey) subpoenas demanding (he appear) in court.
语法与词汇---- where the American craft movement seems to have flourished most vigorously, partly through its association with the Prairie School of Architecture.
语法与词汇(When) rocks are (picked up) by moving water, they are gradually (reduced size) by (the) breaking away of the edges and corners.
语法与词汇Stage producers Klaw and Erlanger were the first to eliminate arguments among leading performers _______in order of appearance, instead of prominence.
语法与词汇_____ skeleton of an insect is on the outside of its body.
语法与词汇The presence in the US during the second world war of ___ European su... was decisive in the development of AE.
语法与词汇First (reported by) Spanish explorers in 1796, (the asphalt) in California''s La Brea Tar Pit was mined (commercial) for (many) years.
语法与词汇Obsidian is (formed) (when) siliceous lava (cools) too rapidly to (crystallized) into rock-fanning minerals.
语法与词汇When the US C authorized a postal service in 1789, ___ 75 local offices.