托福考试

【单选题】（） carries the genes, which determine the hereditary characteristics of the cell or organism. 
A. The chromosome 
B. The chromosome that 
C. Whereas the chromosome 
D. There is a chromosome 

【单选题】stonE tools BEgAn to BE rEplACED ArounD 6,000 yEArs Ago By mEtAl tools, who wErE usED to BuilD instrumEnts AnD simplE mAChinEs.

【单选题】 The word "others" in line 24 refers to
A．( newspapers
B．( ways
C．( temperature maps
D．( weather maps

【单选题】 The word "demise" in line 12 is closest in meaning to
A．( change
B．( recovery
C．( help
D．( death

【单选题】 (By) the end of the nineteenth century, organic chemistry had (develop) new (methods) for the (synthesis) of dyes, perfumes, explosives, and medicines.
A．By
B．develop
C．methods
D．synthesis