46。(A)The latest practices of accurate mapmaking。
) {3 D4 @' C1 E5 z) M/ Y. Z; ~ (B)The impact of epidemics on mass migration。 B2 Y% y% Q' U3 c
(C)The advantages of establishing international trade agreements。
3 {5 }% Z. S6 {4 E9 f (D)The technology used to locate the Old Canada Road。
O3 I$ C8 \4 x b 47。(A)Watch a slide show about trees。* W% k0 n; }! m! f7 w
(B)Learn how to prevent Dutch elm disease。2 y5 a3 _1 `% B# N7 B4 U& R9 {
(C)Study the history of the campus buildings and grounds。
: Y6 S+ A8 l' |" K8 o (D)Look at examples of trees on campus。+ K" ?2 {% Y2 H& j9 u2 O
48。(A)History。) q+ F6 c0 `, S
(B)Physical education。
3 t. f' `! C+ _, x! E0 \/ _$ p/ z* w (C)Botany。. ?% O" q# d& R, w6 U, \) [9 S, G
(D)Architecture。, l5 y1 |% ~8 `
49。(A)Its leaves are yellow。! v/ x7 S. [( |% |2 s) V% P
(B)Its leaves are lopsided。
' l- F6 y' q% `; v5 |9 b9 U, l (C)It is very tall。
8 w3 L* m0 ?" @6 P, u; W0 y% l (D)It is not an angiosperm。5 R: O) F Q; X6 ?2 C9 m' }
50。(A)It has grown too tall for its designated space。
3 m4 z: `9 K0 q% a6 h0 u: i (B)It may be diseased。
6 h# N( t: X0 {4 E. u (C)Its branches are being broken off。2 e* o6 h4 u6 z' T/ ?, Y' D
(D)It no longer hears from。 |